#!/usr/bin/node
const argv = process.argv;
log = console.log;
//validate 空值是否合法
//1 argv number equal 3 数据范围是否合法
if(argv.length !== 3){
  log('cmd exit-code');
  process.exit(1);
}
//code type is number 数据类型是否合法
if(isNaN(Number(argv[2]))){
  log('argv must be number');
  process.exit(2);
}
//code range > 0 模式
if(Number(argv[2])<0){
  log('argv must >= 0 ');
  process.exit(3);
}
process.exit(argv);
